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44
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GEMS.
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ness, excelled all other aventurine stones. He, however, was jealous of his secret, which he carried with him to the grave.
After
many years, in 1827, another Venetian, named Bibaglia, with infinite
labour and perseverance, succeeded in composing a yellowish-brown
enamel, tolerably consistent, but very easily melted, and superior to
all other aventurine in beauty. Its analysis gives
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This, however, like all chemical analyses, is not the formula for the real composition of this substance.
The
sale of this beautiful product of Italian industry yields to our
country, and especially to Venice, from fifty to eighty lire for every
kilogramme of the rough material.
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XIV.
AXINITE.
The name of this mineral is derived from the Latin axis, the edge of the axe, and was given to it because its crystalline form resembles that utensiL It is also
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